One of the dangers Kevin Burke and I have talked about with judges around the country is that of multitasking. As we have noted elsewhere, for more than 97% of us, task switching (what really happens when we try to multitask) has a cost in performance. Unfortunately, studies also show that most people think they actually are good at multitasking and more efficient as a result.

On the bench, this can have the negative effect of having a judge less aware of evidence being presented, objections being made, or subtle but important actions by courtroom participants. In a car, we are learning all too frequently that multitasking drivers can cause devastating consequences.

Now it appears that we can add handing out award envelopes at the Oscars to that list.

The Wall Street Journal had an excellent article yesterday telling what we know at this point. And it sure looks like multitasking played a key role that has caused embarrassment and potential repetitional damage to a big accounting firm, PricewaterhouseCoopers LLP, and one of its partners, Brian Cullinan.

Cullinan and another PricewaterhouseCoopers partner had what seems a fairly simple—and enjoyable—job for Oscars night: stand backstage and hand the award envelopes for the 24 major-category awards to the presenter right before that person heads on-stage. So, each time the presenter came up from the opposite side of the stage, Cullinan or his partner would have to put the unused envelope in their possession aside and make the next award’s envelope ready to go.

The multitasking problem appears to have happened between the next-to-last award to be announced—best actress in a leading role—and the final award for best picture.

After Emma Stone won the Best Actress Oscar, she came to Cullinan’s side of the stage. He then tweeted out a picture of her standing nearby with the comments, “Best Actress Emma Stone backstage! #PWC.” About three minutes later, Cullinan gave Warren Beatty and Faye Dunaway the wrong envelope as they headed on-stage.

The Journal reports that Cullinan doesn’t think his tweeting caused the error. But we know that most people don’t think their performance is degraded by multitasking. Like a judge on the bench—or all of us at one time or another—Cullinan had a single, very important task to focus on. We may never know for sure whether his decision to enjoy watching Emma Stone leave the stage, take a photo, and put out a tweet caused him to make an error that he now deeply regrets. But there’s a strong chance it did, and it’s a lesson we all should take in.

[Note: New details from behind the scenes have been published in Varietyand the Washington Post, and they seem to add to the case that there were lots of distractions for Cullinan.]